Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995ap%26ss.234...39l&link_type=abstract
Astrophysics and Space Science, Volume 234, Issue 1, pp.39-48
Astronomy and Astrophysics
Astrophysics
2
Scientific paper
The semi-empirical mass — radius relations of X-ray pulsars, which depend on the ‘exterior’ behavior of X-ray pulsars, are calculated for four X-ray pulsars, Cen X-3, 4U 1626 67, Her X-1 and EXO 2030+375, based on the observed data and our modified accretion torque model. Comparison between the calculated and the theoretical mass — radius relations shows that three of them, Cen X-3, 4U 1626 67 and EXO 2030+375, are consistent with the stiff or intermediate stiff equations of state, yielding the masses and radii around the typical values of neutron stars. Her X-1 seems not to be well described by the standard equations of state, though it may be reconciled with the soft equation of state.
Li Xiangdong
Wang Zhenru
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